Question

我正在使用GPUImage库将视频录制到文件系统上的文件中。我把它保存为m4v文件。这是我正在使用的代码：

    NSString *pathToMovie = [NSHomeDirectory() stringByAppendingPathComponent:recordingDestination];
    unlink([pathToMovie UTF8String]);
    NSURL *movieURL = [NSURL fileURLWithPath:pathToMovie];

    movieWriter = [[GPUImageMovieWriter alloc] initWithMovieURL:movieURL size:CGSizeMake(1280.0, 720.0)];
    [videoCameraFilter addTarget:movieWriter];

    movieWriter.shouldPassthroughAudio = YES;
    movieFile.audioEncodingTarget = movieWriter;
    [movieFile enableSynchronizedEncodingUsingMovieWriter:movieWriter];

    [movieWriter startRecording];
    [movieFile startProcessing];

    [movieWriter setCompletionBlock:^{
        [videoCameraFilter removeTarget:movieWriter];
        [movieWriter finishRecording];
    }];

这会录制m4v视频。然后我尝试用MPMoviePlayerController：

播放它

    NSString *videoPath = [NSString stringWithFormat:@"%@/%@", [NSHomeDirectory() stringByAppendingPathComponent:@"Documents"], [libraryFiles objectAtIndex:selectedCell]];
    NSLog(videoPath);
    NSURL *url=[[NSURL alloc] initWithString:videoPath];
    MPMoviePlayerController *moviePlayer=[[MPMoviePlayerController alloc] initWithContentURL:url];

    [[NSNotificationCenter defaultCenter] addObserver:self selector:@selector(moviePlayBackDidFinish) name:MPMoviePlayerPlaybackDidFinishNotification object:moviePlayer];
    [[NSNotificationCenter defaultCenter] addObserver:self selector:@selector(moviePlayBackDonePressed) name:MPMoviePlayerDidExitFullscreenNotification object:moviePlayer];

    moviePlayer.controlStyle=MPMovieControlStyleDefault;
    [moviePlayer play];
    [self.view addSubview:moviePlayer.view];
    [moviePlayer setFullscreen:YES animated:YES];

然而，玩家只是开始缓冲而没有任何反应。视频无法播放。玩家只是永远缓冲。应用程序没有崩溃，控制台中没有警告，所以我不知道是什么问题。

Answer 1

试试这个：

首先检查videoPath它是否显示正确的路径？

.h文件

   MPMoviePlayerController*     player

的.m @synthesize播放器;

    -(void) viewWillAppear:(BOOL)animated {
            [super viewWillAppear:animated];

           player = [[MPMoviePlayerController alloc] initWithContentURL:[NSURL URLWithString:videoPath]];
           player.scalingMode = MPMovieScalingModeFill;
           player.movieSourceType = MPMovieSourceTypeFile;
           player.view.frame = CGRectMake(0, 45, 320, 400);
           player.shouldAutoplay = YES;
           [player prepareToPlay];
           [self.view addSubview:player.view];
           [[NSNotificationCenter defaultCenter] addObserver:self selector:@selector(movieFinishedCallback:) name:MPMoviePlayerPlaybackDidFinishNotification object:player];

           [player play];
    }

    #pragma mark MoviPlayer Method

    - (void) movieFinishedCallback:(NSNotification*) aNotification {
            MPMoviePlayerController *player1 = [aNotification object];
            [[NSNotificationCenter defaultCenter] removeObserver:self name:MPMoviePlayerPlaybackDidFinishNotification object:player1];
            [player stop];
            [player1.view removeFromSuperview];

            player1 = nil;
            [self.navigationController popViewControllerAnimated:YES];
    }

    -(void) dealloc {
            [player release];
            [super dealloc];
    }

Answer 2

我看到一些看起来不正确的事情。

首先，你直接写入NSHomeDirectory，它返回的应用程序目录不可写（参见reference）。请改为写入Documents文件夹或Library/Caches文件夹。

其次，我不知道如何定义videoCameraFilter。您需要确保将其添加为movieFile

的目标

GPUImageMovie *movieFile = [[GPUImageMovie alloc] initWithURL:sampleURL];

NSArray *paths = NSSearchPathForDirectoriesInDomains(NSDocumentDirectory, NSUserDomainMask, YES);
NSString *documentsDirectory = [paths objectAtIndex:0];
NSString *pathToMovie = [documentsDirectory stringByAppendingPathComponent:@"filtered-movie.m4v"];
unlink([pathToMovie UTF8String]);
NSURL *movieURL = [NSURL fileURLWithPath:pathToMovie];

GPUImageMovieWriter *movieWriter = [[GPUImageMovieWriter alloc] initWithMovieURL:movieURL size:CGSizeMake(1920.0, 1080.0)];
GPUImageBoxBlurFilter * videoCameraFilter = [[GPUImageBoxBlurFilter alloc] init]; // just a random filter...
videoCameraFilter.blurSize = 2.0;
[movieFile addTarget:videoCameraFilter];
[videoCameraFilter addTarget:movieWriter];

movieWriter.shouldPassthroughAudio = YES;
movieFile.audioEncodingTarget = movieWriter;
[movieFile enableSynchronizedEncodingUsingMovieWriter:movieWriter];

[movieWriter startRecording];
[movieFile startProcessing];

__weak GPUImageMovieWriter *weakMoviewWriter = movieWriter;
[movieWriter setCompletionBlock:^{
    [movieFile removeTarget:weakMoviewWriter];
    [weakMoviewWriter finishRecording];
}];

*编辑：

你有没有尝试过@ moviePlayer @SAMIR RATHOD建议的@property (nonatomic, strong) MPMoviePlayerController *moviePlayer;属性/ ivar？电影播放器无休止地停留在那里的事实很可能是因为它没有被保留所致。

在viewController的界面中添加一个属性：

MPMoviewPlayerController

并实例化您的self.moviePlayer = [[MPMoviePlayerController alloc] initWithContentURL:url];：

{{1}}

无法通过GPUImage播放录像机

2 个答案: